Sound level calibrator

Abstract

The utility model discloses a sound level calibrator, and relates to the technical field of calibration. The sound box comprises a shell assembly, a circuit assembly, a sounder and a battery, wherein the shell assembly is provided with a sound transmission hole; the circuit assembly is arranged in the shell assembly and comprises a sound production signal generation module and an environment parameter detection module electrically connected with the sound production signal generation module, and the environment parameter detection module comprises one or more of a temperature sensor, an air pressure sensor and a humidity sensor; the sounder is arranged in the shell assembly and corresponds to the sound transmission hole, sounds are produced outwards through the sound transmission hole, and the sounder is electrically connected with the circuit assembly; the battery is arranged in the shell assembly, and the circuit assembly is electrically connected with the battery; the sounding signal generation module controls the sounder to sound according to a detection signal of the environmental parameter detection module. By arranging one or more of the temperature sensor, the air pressure sensor and the humidity sensor, the sound level calibrator can compensate the sound pressure of the emitted sound, so that the sound pressure level of the emitted sound is more accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of acoustic calibration, in particular to a sound level calibrator. Background Art

[0002] A sound level meter is an instrument used to measure the sound level of sound. After a long period of use or after maintenance, the precision and accuracy of the sound level meter must be calibrated to improve the precision and accuracy of the sound level meter and ensure the accuracy of the measurement.

[0003] During the calibration process of the sound level meter, a sound level calibrator is required. The sound level calibrator can emit a standard sound pressure level according to the calibration requirements. By comparing it with the standard sound pressure level, it is determined whether the reading of the sound level meter is accurate; if the reading of the sound level meter is significantly different from the standard sound pressure and exceeds the error range, the sound level meter needs to be adjusted so that the reading of the sound level meter is the same as the standard sound pressure or within the error range.

[0004] The sound level calibrator emits sound of standard sound pressure level through the sound generator, but under different temperatures, humidity and air pressure, the sound generator generates sound under the same sound signal drive, and the sound pressure of the sound emitted will deviate from the preset sound pressure, thereby reducing the calibration accuracy of the sound level meter. In addition, the existing sound level calibrator has a complex structure and is not easy to install.

[0005] The above content is only used to help understand the technical solution of this application. Utility Model Content

[0006] The utility model aims to provide a sound level calibrator, which can compensate the sound pressure of the sound emitted according to temperature, humidity and air pressure, so that the sound pressure level emitted by the sound level calibrator is more accurate.

[0007] In order to achieve the above-mentioned utility model object, the utility model proposes a sound level calibrator, which includes:

[0008] The shell assembly is provided with a sound transmission hole;

[0009] A circuit assembly, disposed in the housing assembly, comprising a sound signal generating module and an environmental parameter detection module electrically connected to the sound signal generating module, wherein the environmental parameter detection module comprises one or more of a temperature sensor, an air pressure sensor and a humidity sensor;

[0010] a sound generator, which is disposed in the housing assembly and corresponds to the sound transmission hole, and emits sound outward through the sound transmission hole, and the sound generator is electrically connected to the circuit assembly; and

[0011] A battery is disposed in the housing assembly, and the circuit assembly is electrically connected to the battery;

[0012] The sound signal generating module controls the sound generator to make sound according to the detection signal of the environmental parameter detection module.

[0013] Furthermore, the sound signal generating module includes a control chip, a waveform generator capable of generating a driving waveform, a first digital potentiometer for adjusting the amplitude of the driving waveform, and an amplifier capable of increasing the waveform amplitude. The waveform generator and the first digital potentiometer are both electrically connected to the control chip, the first digital potentiometer is electrically connected between the waveform generator and the amplifier, the control chip can control the first digital potentiometer to adjust the amplitude of the driving waveform, and the amplifier is electrically connected to the sound generator.

[0014] Furthermore, the sound signal generating module also includes a second digital potentiometer electrically connected between the amplifier and the sound generator, and the second digital potentiometer can adjust the amplitude of the waveform input to the sound generator.

[0015] Furthermore, the sound signal generating module includes a control chip, and the circuit component also includes a voltage detection circuit for detecting the working voltage of the air pressure sensor, and the voltage detection circuit is electrically connected to the air pressure sensor and the control chip.

[0016] Furthermore, the shell assembly includes a mounting frame, a cover body provided with the sound transmission hole, and a shell detachably connected to the cover body, the cover body and the shell form a receiving cavity for accommodating the circuit assembly, the sound generator and the battery, and the circuit assembly, the sound generator and the battery are all arranged on the mounting frame to form a whole for assembly.

[0017] Further, the mounting frame includes a first plate portion, a second plate portion, and a rod portion connected between the first plate portion and the second plate portion, and openings are provided at both ends of the shell, and the first plate portion and the second plate portion seal the openings at both ends of the shell;

[0018] The circuit assembly comprises a circuit board fixed on the rod portion, and the battery is connected to the rod portion and the circuit board.

[0019] Furthermore, the number of the rods is at least two and they are arranged at intervals, and an installation space is formed between the rods, the circuit board, the first plate portion and the second plate portion, and the battery is arranged in the installation space.

[0020] Furthermore, a cushion block is provided between the circuit board and the rod portion, and two ends of the battery located in the thickness direction of the circuit board are respectively located on both sides of the rod portion.

[0021] Further, the circuit assembly further comprises a switch, wherein the switch is at least partially located outside the housing assembly for manual operation;

[0022] The switch and the cover are respectively located at two ends of the housing, and the switch is connected to the second plate portion and is exposed through an opening at an end of the housing away from the cover.

[0023] Furthermore, the sound transmission hole is arranged on the cover body, the cover body comprises a second inner cavity and a convex portion communicating with the sound transmission hole, an inner convex ring is arranged at the end of the shell body away from the cover body, and both ends of the mounting frame are respectively limited by the convex portion and the inner convex ring;

[0024] A limiting portion is provided on the surface of the first plate portion facing the cover body, and the limiting portion is provided with a limiting hole for limiting the sound generator, and the sound generator is arranged in the second inner cavity.

[0025] Furthermore, the cover body and the housing and / or the cover body and the mounting frame are connected by threaded connection or snap connection;

[0026] Furthermore, the mounting frame is clamped between the cover body and the shell.

[0027] Compared with the prior art, the utility model has the following beneficial effects: the sound level calibrator includes a housing component, a circuit component, a sound generator and a battery, the circuit component includes a sound signal generating module and an environmental parameter detection module electrically connected to the sound signal generating module, the environmental parameter detection module includes one or more of a temperature sensor, an air pressure sensor and a humidity sensor; the sound signal generating module controls the sound generator to sound according to the detection signal of the environmental parameter detection module. By setting one or more of the temperature sensor, the air pressure sensor and the humidity sensor, the sound level calibrator can compensate the sound pressure of the sound according to one or more factors of the temperature, humidity and air pressure in the environment, so that the sound pressure level emitted is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a stereoscopic diagram of a sound level calibrator according to an embodiment of the present utility model.

[0029] Figure 2 yes Figure 1 Exploded view of the sound level calibrator shown.

[0030] Figure 3 The utility model is a circuit control diagram of a sound level calibrator in one embodiment.

[0031] Figure 4 yes Figure 1 The schematic diagram of the connection relationship between the mounting frame and the circuit board of the sound level calibrator is shown.

[0032] Figure 5 yes Figure 1 A cross-sectional view of the sound level calibrator is shown.

[0033] Figure 6 yes Figure 1 A cross-sectional view of the sound level calibrator is shown. Figure 5 and Figure 6 The cutting angle is different.

[0034] Figure 7 yes Figure 1 A perspective view of the cover of the sound level calibrator is shown.

[0035] Figure 8 yes Figure 1 A perspective view of the housing of the sound level calibrator is shown.

[0036] Fig. 9 yes Figure 5 A partial enlarged view of point I in the middle.

[0037] Fig.10 yes Figure 1 A perspective view of the sound generator of the sound level calibrator is shown. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It is to be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some structures related to the present application are shown in the accompanying drawings, rather than all structures. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0039] The terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0040] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0041] like Figures 1 to 3 As shown, a sound level calibrator corresponding to a preferred embodiment of the utility model includes a housing component 1, a circuit component 2, a sound generator 3 and a battery 4.

[0042] The housing assembly 1 is provided with a sound transmission hole 100 , and the housing assembly 1 can be made of materials such as metal or plastic.

[0043] The circuit assembly 2 is arranged in the housing assembly 1, and includes a sound signal generating module 2a and an environmental parameter detection module 2b electrically connected to the sound signal generating module 2a. The environmental parameter detection module 2b includes one or more of a temperature sensor 220, an air pressure sensor 23, and a humidity sensor 221. For example, only one of the three sensors, or two of the three sensors, or all three sensors may be included. The temperature sensor 220 is used to detect the ambient temperature of the sound level calibrator, the air pressure sensor 23 is used to detect the ambient air pressure of the sound level calibrator, and the humidity sensor 221 is used to detect the ambient humidity of the sound level calibrator. The sound signal generating module 2a can control the sound generator 3 to sound according to the detection signal of one or more of the temperature sensor 220, the air pressure sensor 23, and the humidity sensor 221. The battery 4 is arranged in the housing assembly 1, and the circuit assembly 2 is electrically connected to the battery 4. The battery 4 provides power for the sound level calibrator, for example, provides power for the sound generator 3 and the electronic components on the circuit assembly 2.

[0044] The sound generator 3 is arranged in the housing component 1 and is arranged corresponding to the sound transmission hole 100. The sound is transmitted outward through the sound transmission hole 100. The sound generator 3 is electrically connected to the circuit component 2. The sound signal generating module 2a controls the sound generator 3 to make a sound according to the detection signal of the environmental parameter detection module 2b. The sound generator 3 can emit a sound with a sound pressure matching the sound signal under the action of the sound signal. It can be understood that under different temperature, humidity and air pressure conditions, the sound pressure of the sound generated by the sound generator 3 under the same sound signal drive will have deviations, resulting in inaccurate sound pressure of the sound, affecting the calibration of the sound level meter. In order to eliminate the errors caused by temperature and air pressure, the sound signal generating module 2a can compensate the sound signal according to the detection signals of one or more of the temperature sensor 220, the air pressure sensor 23 and the humidity sensor 221 to correct the size of the sound signal, so that the sound pressure level of the sound emitted by the sound generator 3 is more accurate. For example, when the sound actually emitted by the sound generator 3 becomes smaller due to changes in one or more of temperature, air pressure and humidity, the control chip 21 can increase the sound signal according to the smaller sound, so that the sound pressure level of the sound emitted by the sound generator 3 meets the requirements.

[0045] It should be pointed out that when the sound generator 3 is a metal aluminum diaphragm loudspeaker, humidity has little effect on the sound pressure level of the sound level calibrator. Therefore, when the sound generator 3 is a metal aluminum diaphragm loudspeaker, a humidity sensor may not be provided.

[0046] Optionally, the environmental parameter detection module 2 b includes at least a temperature sensor 220 and an air pressure sensor 23 .

[0047] The method of compensating the sound signal according to the detection signal of the environmental parameter detection module 2b can be determined by experiments and other methods. For example, after testing, the sound pressure level of the sound generator 3 is basically linearly related to the temperature. The sound pressure level decreases at high temperatures and increases at low temperatures. The change in sound pressure level caused by a unit temperature change is about 0.08dB. At this time, for every increase of one degree Celsius in temperature, it is only necessary to adjust the sound signal so that the sound pressure level of the sound emitted by the sound generator 21 increases by 0.08dB. The influence of changes in air pressure and humidity on the sound pressure level can also be obtained by experiments and other methods, so as to obtain a specific scheme for adjusting the sound signal. Optionally, the mapping relationship between parameters such as temperature, air pressure, humidity and the compensation value of the sound signal can be obtained by experiments or theoretical calculations, and the corresponding compensation value can be directly retrieved according to the actual measured ambient temperature, air pressure and humidity parameters. Alternatively, the compensation coefficients for adjusting the sound signal such as temperature, air pressure and humidity can be obtained by experiments, and the compensation formula can be obtained, and the sound signal can be compensated according to the formula.

[0048] like Figure 3 As shown, the sound signal generating module 2a includes a control chip 21, a waveform generator 24 capable of generating a driving waveform (generally a sine wave signal), a first digital potentiometer 25 for adjusting the amplitude of the driving waveform, and an amplifier 26 capable of increasing the waveform amplitude. The waveform generator 24 and the first digital potentiometer 25 are both electrically connected to the control chip 21, the first digital potentiometer 25 is electrically connected between the waveform generator 24 and the amplifier 26, and the amplifier 24 is electrically connected to the sound generator 3; optionally, the control chip 21 is a single-chip microcomputer. The control chip 21 can control the operation of the waveform generator 24. In some embodiments, the waveform generator 24 can generate a sine wave driving waveform, and the frequency and phase of the generated sine wave can be set by the control chip 21. The control chip 21 can also adjust the amplitude of the driving waveform through the first digital potentiometer 25, thereby compensating the driving waveform. The compensated driving waveform is amplified by the amplifier 26 and enters the sound generator 3. The signal entering the sound generator 3 is the sound signal.

[0049] Optionally, the first digital potentiometer 25 is a 10K potentiometer, which can be divided into 256 levels, and is used to adjust the waveform amplitude, and works under the control of the control chip 21. While amplifying the waveform amplitude, the amplifier reduces its output impedance to drive the sound generator 3. The waveform generator 24 can be, for example, a digital direct frequency synthesizer (DDS).

[0050] In some embodiments, when working, the control chip 21 generates a corresponding correction signal according to the detection signal of the temperature, air pressure or humidity sensor and sends it to the first digital potentiometer 25; at the same time, the control chip 21 controls the waveform generator 24 to generate a sine wave signal, and the sine wave signal is transmitted to the first digital potentiometer 25 through a wire; the first digital potentiometer 25 will correct the sine wave signal according to the correction signal generated by the control chip 21, adjust the amplitude of the sine wave, thereby adjusting the sound pressure emitted by the generator 3, and improving the accuracy of the sound pressure level emitted by the sound level calibrator.

[0051] In some embodiments, Figure 3 As shown, the control device 21 also includes a second digital potentiometer 27 capable of adjusting the amplitude of the waveform input to the sound generator 3, and the second digital potentiometer 27 is electrically connected between the amplifier 26 and the sound generator 3. Specifically, the second digital potentiometer 27 can adjust the amplitude of the waveform input to the sound generator 3 so that the sound pressure level of the sound emitted by the sound generator 3 is more accurate. It can be understood that the sound pressure levels generated by different sound generators 3 for the same sound signal when they leave the factory are not necessarily the same, or the sound pressure level of the sound generator 3 itself will change after a certain period of use. This results in the sound pressure level of the sound generated by the sound generator 3 under the same signal also having deviations (this deviation is caused by the sound generator 3 itself, and the external temperature and air pressure have no effect on it); in actual production, in order to facilitate production, the burning program is fixed, and after the program is burned, its waveform amplitude is fixed. Therefore, by setting the second digital potentiometer 27 to adjust the amplitude of the sound signal, the sound pressure level emitted by the sound level calibrator can be made more accurate. Optionally, the second digital potentiometer 27 is electrically connected to the control chip 21 to facilitate adjusting the amplitude of the signal adjusted by the second digital potentiometer 27 .

[0052] In some embodiments, the circuit assembly 2 further includes a voltage detection circuit 28 for detecting the working voltage of the air pressure sensor 23, and the voltage detection circuit 28 is electrically connected to the air pressure sensor 23 and the control chip 21. The voltage of the air pressure sensor 23 is constant when it is working. For example, the working voltage of the air pressure sensor 23 is 5V. When the working voltage is abnormal, the reliability of the air pressure sensor 23 will be affected. The voltage detection circuit 28 is set to detect whether the voltage of the air pressure sensor 23 is within the normal range. If it is not within the normal range, in order to ensure the accuracy of the data, the control chip 21 needs to turn off the waveform generator 24. At this time, the sounder 3 does not sound, so as not to emit an erroneous sound pressure level and affect the accuracy of the sound level meter calibration.

[0053] Specifically, the voltage detection circuit 28 generates a voltage feedback signal according to the voltage of the air pressure sensor 23, and transmits the voltage feedback signal to the control chip 21. The control chip 21 calculates whether the voltage is within a normal threshold range according to the voltage feedback signal, and determines whether to turn off the waveform generator 24 accordingly.

[0054] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the housing assembly 1 includes a mounting frame 12, a cover 10 provided with a sound transmission hole 100, and a housing 11 detachably connected to the cover 10. The cover 10 and the housing 11 form a receiving cavity 110 for accommodating the circuit assembly 2, the sound generator 3, and the battery 4; the cover 10 and the housing 11 are detachably connected, and the cover 10 and the housing 11 can protect the components disposed inside the sound level calibrator, and at the same time, facilitate the installation of the components into the housing assembly 1.

[0055] Furthermore, the circuit assembly 2, the sound generator 3 and the battery 4 are all arranged on the mounting frame 12 to form a whole for assembly, which can further facilitate the installation of the circuit assembly 2, the sound generator 3 and the battery 4 in the housing assembly 1, thereby improving the assembly efficiency.

[0056] Specifically, during the installation of the sound level calibrator, first, the circuit assembly 2, the sound generator 3, the battery 4 and other components can be installed on the mounting frame 12; then, the mounting frame 12 is installed in the receiving cavity 110 formed by the cover body 10 and the shell 11, and the cover body 10 and the shell 11 are connected.

[0057] The mounting frame 12 includes a first plate portion 120, a second plate portion 121, and a rod portion 122 connecting the first plate portion 120 and the second plate portion 121. The housing 11 has openings at both ends. The first plate portion 120 and the second plate portion 121 seal the openings at both ends of the housing 11. Figure 5 As shown, the housing 11 includes a first inner cavity 1102 , that is, a space formed by the first plate portion 120 , the second plate portion 121 and the housing 11 , and the rod portion 122 is disposed in the first inner cavity 1102 .

[0058] like Figure 4 and Figure 5 As shown, the circuit assembly 2 includes a circuit board 20 fixed on the rod 122, and the battery 4 is connected to the rod 122 and the circuit board 20, thereby improving the stability of the battery 4 and the circuit board 20 in the first inner cavity 1102. The control chip 21, sensors (temperature sensor 220, air pressure sensor 23 and humidity sensor 221, etc.), waveform generator 24, first digital potentiometer 25, amplifier 26, second digital potentiometer 27 and voltage detection circuit 28 and other components are integrated on the circuit board 20, so as to facilitate installation and save space.

[0059] In some embodiments, the first plate portion 120, the second plate portion 121 and the rod portion 122 are integrally formed; in other embodiments, the first plate portion 120, the second plate portion 121 and the rod portion 122 are all single parts, which are connected and fixed by welding or screws.

[0060] There are at least two rods 122, which are spaced apart. Optionally, the rods 122 are parallel to each other. An installation space 1100 is formed between the rods 122, the circuit board 20, the first plate 120 and the second plate 121. Part of the battery 4 is disposed in the installation space 1100. The installation space 1100 serves to accommodate and limit the battery 4.

[0061] Furthermore, a pad 123 is provided between the circuit board 20 and the rod portion 122 to increase the installation space 1100. The batteries 4 are located at both ends of the circuit board 20 in the thickness direction and are respectively located on both sides of the rod portion 122. Optionally, the components included in the circuit assembly 2 are arranged on the surface of the circuit board 20 away from the battery 4 to reduce the occupation of the installation space 1100 and increase the volume of the battery 4 that can be installed.

[0062] In some embodiments, Figure 2 , Figure 4 and Figure 6 As shown, there are two rods 122 which are arranged parallel to each other and spaced apart. The plane where the two rods 122 are located divides the first inner cavity 1102 into two parts. By setting the pad 123, the installation space 1100 can be enlarged and the center of gravity of the battery 4 can be as close as possible to the center of the installation space 1100, thereby improving the stability and volume of the battery 4.

[0063] like Figure 5 As shown, the circuit assembly 2 further comprises a switch 29, which is at least partially located outside the housing assembly 1 for manual operation, thereby facilitating the opening and closing of the sound level calibrator.

[0064] The switch 29 and the cover 10 are respectively located at two ends of the housing 11. The switch 29 is connected to the second plate portion 121 and is exposed through an opening at the end of the housing 11 away from the cover 10. The housing 11 can be a three-dimensional shape such as a cylinder or a square.

[0065] In some embodiments, when the sound level calibrator is assembled, the mounting bracket 12 is clamped between the cover body 10 and the shell 11, for example, it can be fixed under the clamping of the cover body 10 and the shell 11. After the cover body 10 and the shell 11 are installed, the two ends of the mounting bracket 12 are abutted and limited by the cover body 10 and the shell 11.

[0066] The sound transmission hole 100 is arranged on the cover body 10, and the cover body 10 includes a second inner cavity 1101 communicating with the sound transmission hole 100 and an annular convex portion 101 protruding outward from the housing 11 (such as Figure 7 As shown in FIG. 1 , the end of the housing 11 away from the cover 10 is provided with an inner convex ring 111, and the two ends of the mounting frame 12 are respectively in contact with the convex portion 101 and the inner convex ring 111, thereby achieving the effect of fixing and limiting the mounting frame 12. Figure 5 As shown, the first plate portion 120 and the second plate portion 121 of the mounting frame 12 are in contact with the convex portion 101 and the inner convex ring 111 respectively.

[0067] The first plate portion 120 is provided with a limiting portion 1200 on the surface facing the cover body 10. The limiting portion 1200 is provided with a limiting hole 1201 for limiting the sound generator 3. When the sound generator 3 is installed on the mounting bracket 12, part of the sound generator 3 is located in the limiting hole 1201. When the mounting bracket 12 with the sound generator 3 is connected to the cover body 10, the sound generator 3 is located in the second inner cavity 1101. When installing the sound generator 3, first, the sound generator 3 is placed in the limiting hole 1201. At this time, the limiting hole 1201 plays a limiting role for the sound generator 3, avoiding the deviation of the position of the sound generator 3 when installing the cover body 10, thereby facilitating installation; when the cover body 10 and the housing 11 are installed, the sound generator 3 is clamped and fixed between the cover body 10 and the limiting portion 1200, thereby fixing the sound generator 3.

[0068] Further, such as Figure 7 , Fig. 9 and Fig.10 As shown, the sound generator 3 includes a first portion 30 disposed in the limiting hole 1201 and a first boss 31 radially protruding outward relative to the first portion 30, and the cover plate 10 also includes a second boss 102 abutting against the sound generator 3. The sound generator 3 is clamped and fixed between the second boss 102 and the limiting portion 1200 of the cover body 10 through the first boss 31, thereby playing a role in fixing the sound generator 3. The first plate portion 120 is provided with a wiring hole, and the sound generator 3 and the circuit board 20 are electrically connected through a wire. Optionally, the sound generator 3 is provided with a connecting portion 33 connected to the wire.

[0069] In some embodiments, the limiting portion 1200 is an integral annular convex portion; in other embodiments, the limiting portion 1200 is composed of a plurality of individual convex portions. Figure 4 As shown, the limiting portion 1200 is composed of two separate protrusions.

[0070] The cover body 10 and the shell body 11 can be detachably connected by a threaded connection or a snap-fit ​​connection; it is understandable that, under the premise of convenient disassembly, the cover body 1 and the shell body 11 can be connected by a threaded connection or a snap-fit ​​connection according to actual conditions.

[0071] In some embodiments, the mounting frame 12 and the cover body 10 can be connected by a threaded connection or a snap connection. For example, an external thread can be provided on the outside of the limiting portion 1200, and an internal thread can be provided on the inner surface of the convex portion 101, so as to achieve a threaded connection. It can be understood that when the mounting frame 12 and the cover body 10 are connected by a threaded or snap connection, the mounting frame 12 may not be clamped between the cover body 10 and the shell 11, and is fixed by connecting with the cover body 10. Of course, it can also be clamped to further prevent the mounting frame 12 from loosening. In some embodiments, the surfaces of the convex portion 101 and the limiting portion 1200 are smooth, and the limiting portion 1200 is inserted in the convex portion 101. The two can move relative to each other along the axial direction, and the mounting frame 12 is fixed and limited by the clamping of the cover body 10 and the shell 11.

[0072] The above are only specific implementations of the present invention, and any improvements made based on the concept of the present invention are considered to be within the protection scope of the present invention.

Claims

1. A sound level calibrator, characterized in that: include: The housing assembly (1) is provided with a sound transmission hole (100); A circuit component (2) is arranged in the housing component (1), comprising a sound signal generating module (2a) and an environmental parameter detecting module (2b) electrically connected to the sound signal generating module (2a), wherein the environmental parameter detecting module (2b) comprises one or more of a temperature sensor (220), an air pressure sensor (23) and a humidity sensor (221); a sound generator (3) disposed in the housing component (1) and corresponding to the sound transmission hole (100), emitting sound outward through the sound transmission hole (100), the sound generator (3) being electrically connected to the circuit component (2); and, A battery (4) is disposed in the housing assembly (1), and the circuit assembly (2) is electrically connected to the battery (4); The sound signal generating module (2a) controls the sound generator (3) to generate sound according to the detection signal of the environmental parameter detection module (2b).

2. The sound level calibrator according to claim 1, characterized in that: The sound signal generating module (2a) comprises a control chip (21), a waveform generator (24) capable of generating a driving waveform, a first digital potentiometer (25) for adjusting the amplitude of the driving waveform, and an amplifier (26) capable of increasing the amplitude of the waveform, the waveform generator (24) and the first digital potentiometer (25) are both electrically connected to the control chip (21), the first digital potentiometer (25) is electrically connected between the waveform generator (24) and the amplifier (26), the control chip (21) can control the first digital potentiometer (25) to adjust the amplitude of the driving waveform, and the amplifier (26) is electrically connected to the sound generator (3).

3. The sound level calibrator according to claim 2, characterized in that The sound signal generating module (2a) further comprises a second digital potentiometer (27) electrically connected between the amplifier (26) and the sound generator (3), wherein the second digital potentiometer (27) is capable of adjusting the amplitude of the waveform input to the sound generator (3).

4. The sound level calibrator according to claim 1, characterized in that The sound signal generating module (2a) comprises a control chip (21), and the circuit component (2) further comprises a voltage detection circuit (28) for detecting the working voltage of the air pressure sensor (23), wherein the voltage detection circuit (28) is electrically connected to the air pressure sensor (23) and the control chip (21).

5. The sound level calibrator according to any one of claims 1 to 4, characterized in that: The housing assembly (1) comprises a mounting frame (12), a cover body (10) provided with the sound transmission hole (100), and a housing (11) detachably connected to the cover body (10); the cover body (10) and the housing (11) form a receiving cavity (110) for accommodating the circuit assembly (2), the sound generator (3), and the battery (4); the circuit assembly (2), the sound generator (3), and the battery (4) are all arranged on the mounting frame (12) to form a whole for assembly.

6. The sound level calibrator according to claim 5, characterized in that: The mounting frame (12) comprises a first plate portion (120), a second plate portion (121), and a rod portion (122) connected between the first plate portion (120) and the second plate portion (121); openings are provided at both ends of the shell (11); the first plate portion (120) and the second plate portion (121) seal the openings at both ends of the shell (11); The circuit assembly (2) comprises a circuit board (20) fixed on the rod portion (122), and the battery (4) is connected to the rod portion (122) and the circuit board (20).

7. The sound level calibrator according to claim 6, characterized in that The number of the rod portions (122) is at least two and they are arranged at intervals; an installation space (1100) is formed between the rod portions (122), the circuit board (20), the first plate portion (120) and the second plate portion (121); and the battery (4) is arranged in the installation space (1100).

8. The sound level calibrator according to claim 7, characterized in that A cushion block (123) is provided between the circuit board (20) and the rod portion (122); the batteries (4) are located at two ends of the circuit board (20) in the thickness direction and are respectively located on two sides of the rod portion (122).

9. The sound level calibrator according to claim 6, characterized in that: The circuit assembly (2) further comprises a switch (29), wherein the switch (29) is at least partially located outside the housing assembly (1) for manual operation; The switch (29) and the cover body (10) are respectively located at two ends of the shell (11); the switch (29) is connected to the second plate portion (121) and is exposed through an opening at an end of the shell (11) away from the cover body (10).

10. The sound level calibrator according to claim 6, characterized in that: The sound transmission hole (100) is arranged on the cover body (10), the cover body (10) comprises a second inner cavity (1101) and a convex portion (101) which are communicated with the sound transmission hole (100), an inner convex ring (111) is arranged at the end of the shell (11) away from the cover body (10), and two ends of the mounting frame (12) are respectively limited by the convex portion (101) and the inner convex ring (111); A limiting portion (1200) is provided on the surface of the first plate portion (120) facing the cover body (10), and the limiting portion (1200) is provided with a limiting hole (1201) for limiting the sound generator (3), and the sound generator (3) is arranged in the second inner cavity (1101).

11. The sound level calibrator according to claim 5, characterized in that: The cover body (10) and the housing (11) and / or the cover body (10) and the mounting frame (12) are connected via threads or snaps.

12. The sound level calibrator according to claim 5, characterized in that: The mounting frame (12) is clamped between the cover body (10) and the shell (11).

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